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See detailLa recherche d’une forme théâtrale pour les sans-voix
Delhalle, Nancy ULg

Conference (2009, July 17)

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See detailDiversity management status in morocco. an exploratory stydu
El Abboubi, Manal ULg; El Kandoussi, Fatima

Conference (2009, July 16)

The purpose of this article is to explore diversity management specificities in arab countries, especially in Morocco (North Africa). We analyse organisational initiatives, managers’ perception and the ... [more ▼]

The purpose of this article is to explore diversity management specificities in arab countries, especially in Morocco (North Africa). We analyse organisational initiatives, managers’ perception and the way they mainstream diversity tools in their management. The Moroccan industry is based on two major sectors: agriculture food and textile. Those two activities represent more than 50% of the PIB, 70% of the national employment and 75% of exportations. We focus our study on those two sectors which are a pillar of the morrocan economy. Our sample consist of 30 questionnaire sent to companies that have more than 50 employees. We received 16 answers. We questioned CEOs, managers, middle managers and employees. The main contribution of the research is that moroccan leaders are aware of their responsibilities to implement and carry out diversity projects. The main topics mentioned concerns equality and gender. However, they have no skills or power to ensure that responsibilities fully. Diversity management is not included in the strategy. It remains a minor task operated mainly by the human resource department. Morrocan managers need more specific trainings and a global governmental policy to guide their actions. Employees are not well informed about their rights. Moreover, Morocco will open a free exchange zone in 2010. This is an opportunity for many international companies to invest in the country. Most of them are from Europe and USA. They are well informed about diversity management, especially gender issues. This represents a threat for Moroccan companies who feel the urgency to develop a national framework for diversity management. Our research is still under study. We are collecting more data and we aim to integrate some extra stakeholders in the sample. Mainly the government and the local communities. The fact that we interviewed only managers gives us a limited view of the diversity management status in Morocco. [less ▲]

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See detailSérologies Mycoplasma pneumoniae et Chlamydia au CHU de Liège.
HUYNEN, Pascale ULg

Conference (2009, July 16)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailA Capability Approach to the European Directive on Parental Leave
Orianne, Jean-François ULg

Conference (2009, July 16)

Detailed reference viewed: 32 (7 ULg)
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See detailUnusual quantitative (co)polymer chain coupling reaction based on isoprene and cobalt complexes
Debuigne, Antoine ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg

Conference (2009, July 15)

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and ... [more ▼]

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and well-defined molecular parameters. In this context, we designed an innovative and very promising tool for macromolecular engineering. This technique, called Isoprene-Assisted Radical Coupling (I-ARC), allows to couple quantitatively polymer chains preformed by Cobalt-Mediated Radical Polymerization (CMRP), an efficient controlled radical polymerization system for vinyl acetate (VAc) and acrylonitrile (AN). Typically, addition of isoprene to well-defined polymers prepared by CMRP invariably leads to the quantitative coupling reaction of the chains, as assessed by the perfect doubling of the molar mass of the polymer. Importantly, the I-ARC reaction is not limited to macromolecules with low molar masses and homopolymers, contrary to the previously reported radical chains coupling methods. Indeed, when applied to diblock copolymers, I-ARC constitutes a straightforward approach for the synthesis of telechelic symmetrical ABA triblock copolymers, as illustrated by the preparation of poly(vinyl acetate)-b-poly(acrylonitrile)-bpoly(vinyl acetate) triblock copolymers and their derivatives. [less ▲]

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Peer Reviewed
See detailProfessional acts and services rendered by psychologists : a Belgian study.
Hansez, Isabelle ULg; Mormont, Marie; Côte, Virginie

Conference (2009, July 10)

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See detailSteel construction and sustainability
Reiter, Sigrid ULg

Conference (2009, July 10)

Detailed reference viewed: 33 (9 ULg)
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See detailLeuven English Old to New (LEON): Some ideas on a new corpus for longitudinal diachronic studies.
Petré, Peter ULg

Conference (2009, July 09)

Despite the explosion of diachronic corpora of English in the last few decades, still not a single corpus exists that covers the entire documented history of English. Although its compilation is generally ... [more ▼]

Despite the explosion of diachronic corpora of English in the last few decades, still not a single corpus exists that covers the entire documented history of English. Although its compilation is generally perceived as most attractive (Rissanen 2000: 13), corpus compilers do not seem to believe in its creation in the near future. This is regrettable, as many linguists dealing with longitudinal developments such as grammaticalization need to cover very long time spans, and are forced to combine several, not necessarily compatible, corpora (e.g. Hilpert 2008, van Linden 2009). Clearly, their results are less reliable than they might be if a single corpus existed (for example, Gries and Hilpert’s data (2008) show a major shift in the collocational profile of shall about 1710; however, this is precisely where one corpus they use ends and a second – rather different one – begins). So I tentatively started compiling a corpus myself, provisionally called LEON (Leuven English Old to New). The basic architecture of LEON comprises a 400,000 word corpus for each HC-period, and after 1710 for the periods 1710-1780, 1780-1850, 1850-1920, 1920-1990 and post-1990. Data available from 1250-1350, a less well represented period, serve as a template on which other subperiods are to be based to acquire best comparability of genre and region. To make up for the lack of some genres (letters, diaries) and social stratification, for each period after 1350 an additional, selfsufficient 600,000 words corpus is envisaged. While LEON is primarily conceived as a ‘meta-corpus’, mining existing corpora, some additions are envisaged too (e.g. the unedited Statutes Rwl. B.520, dated a1325). LEON does not aim at full comparability (which would be presumptuous), but wants to optimize the usefulness of concepts like ‘equal size of subperiods’ or ‘diachronic text prototype’ (HC). LEON might be, as compared to the present ‘big evil’, a ‘lesser evil’. References Gries, Stefan Th. and Martin Hilpert. The identification of stages in diachronic data: variability-based neighbour clustering. Corpora Vol. 3 (1): 59–81. Hilpert, Martin. 2008. Germanic future constructions A usage-based approach to language change. Amsterdam & Philadelphia: John Benjamins. Los, Bettelou. 2005. The rise of the to-infinitive. Oxford: Oxford University Press. Rissanen, Matti & Merja Kytö. 1993. General introduction. In Rissanen, Matti, Merja Kytö & Minna Palander-Collin, eds. 1993. Early English in the computer age: Explorations through the Helsinki Corpus. Berlin: Mouton de Gruyter. 1-17. Rissanen, Matti. 2000. The world of English historical corpora: From Cædmon to computer age. Journal of English Linguistics 28: 7-20. van Linden, An. 2009. Dynamic, deontic and evaluative adjectives and their clausal complement patterns: A synchronic-diachronic account. PhD dissertation, University of Leuven. [less ▲]

Detailed reference viewed: 46 (1 ULg)
See detailIR and UV spectroscopic signatures of DNA structures in the gas phase
Gabelica, Valérie ULg

Conference (2009, July 08)

Detailed reference viewed: 11 (0 ULg)
Peer Reviewed
See detailOCCP Seminar on Dominant Positions and New Technologies
Petit, Nicolas ULg

Conference (2009, July 08)

Detailed reference viewed: 4 (0 ULg)
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See detailSur la philosophie politique de l’éducation (Foucault, Alain, Canguilhem)
Bolmain, Thomas ULg

Conference (2009, July 08)

Ce travail consiste pour l'essentiel en une brève réévaluation des Propos sur l'éducation d'Alain (1932). Ce travail est entrepris à la lumière d'un problème précis : celui des rapports entre philosophie ... [more ▼]

Ce travail consiste pour l'essentiel en une brève réévaluation des Propos sur l'éducation d'Alain (1932). Ce travail est entrepris à la lumière d'un problème précis : celui des rapports entre philosophie critique et apprentissage à la philosophie (et, corrélativement, l'importance de la position du maître dans ce processus). Les recherches d'Alain devront à cet égard être rapprochées de certaines propositions de G. Canguilhem (élève du précédent) et de M. Foucault (lui-même disciple de Canguilhem). Au total, on montrera qu'une réflexion sur l'éducation est indispensable à l'éclaircissement du concept de critique, qui fait le centre de la philosophie depuis Kant. [less ▲]

Detailed reference viewed: 37 (7 ULg)
See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

Conference (2009, July 08)

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to ... [more ▼]

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to one or more competitors. The objective of the firm is to determine the locations of the new facilities and their attractiveness levels to maximize the profit. We formulate a mixed-integer nonlinear programming model for this problem and propose three methods for its solution: a Lagrangean heuristic, two branch-and-bound methods using Lagrangean and nonlinear programming relaxations. [less ▲]

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See detailDesertification in the Sahel: climatic or human driven causes?
Ozer, Pierre ULg; Ozer, André ULg

Conference (2009, July 07)

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the early 1990, rainfalls record an amelioration that tends towards the average of ... [more ▼]

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the early 1990, rainfalls record an amelioration that tends towards the average of precipitation previous to the 1970s. However, this improvement may be due to increasing rainfall intensity and it seems that the length of the rainy season did not show any extension when compared to the 1970s and 1980s. On the other hand, the Sahelian population has been multiplied by 3 since 1950 and is foreseen to be multiplied by 10 by the second half of the 21st century. Increasing urban population levels are much more impressive and conduct important environmental distresses every day. Such increasing human pressure leads to uncontrolled deforestation in order to satisfy the needs in fuel wood, wood for construction and shifting cultivation. In addition, always larger herds for contracting range conditions lead to overgrazing and trampling. All these processes provoke the degradation of the vegetation cover, a constant diminution of crop yields, as well as a strong reduction of the biodiversity. One of the numerous consequences is the reactivation of previously fixed dunes that were formed during the last interpluvial phase (18000 BP). Our research provides a state of the art of recent findings and controversy that surround the desertification processes and concludes that if the droughts of the 1970s and 1980s have had dramatic consequences for the population of the Sahel, current and coming increasing human pressure will very likely enhance desertification processes of the southern fringe of the Sahara. [less ▲]

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See detailTherapeutic projects in Belgium : a post-bureaucratic way
Schoenaers, Frédéric ULg; Cerfontaine, Gaëtan ULg

Conference (2009, July 07)

Since the end of the 1980s, a new vision of mental health has been developed under the influence of the Belgian "Psychiatry" permanent work group of the National Council of Hospital Facilities. This new ... [more ▼]

Since the end of the 1980s, a new vision of mental health has been developed under the influence of the Belgian "Psychiatry" permanent work group of the National Council of Hospital Facilities. This new vision adopts a holistic perspective which takes into account the diversity of factors at stake and aims to give a central place to the patient and his or her needs. The principles on which this innovative vision lies fall within an international trend (among other developed in the WHO declaration of Helsinki) which aims to put the patient at the centre of the system but also in field actor practices. This vision is made concrete in a restructuring of mental health care sector in terms of care circuits and networks, which necessitates an "interinstitutional" and interdisciplinary cooperation. With this approach the old bureaucratic model of organising a sector would be replaced by a post-bureaucratic one marked by notions such as networking or negotiation. The "Therapeutic projects", organised by a Royal Decree in 2006 after a long term decision making process, constitute the experimental phase of this new mental health care concept. It is a wide ranging pilot project which aims to achieve, by the end of the three-year experimental phase, the definition of guidelines and the implementation of norms as regards mental health care circuits and networks. The purpose of this contribution is to (1) give a presentation of the mechanisms which have lead to the creation and implementation of the therapeutic project. Using a case study method, we will also (2) analyse the functioning of a therapeutic project, showing at the one hand the tensions between the philosophy of the project (network functioning and flexibility) and the technocratic temptation developed by the administration which funds them, and, at the other hand, we will also examine how the "traditional" psychiatric rationality is able to maintain its central position in a context where other fields and actors should emerge. Finally, (3) as the data that we present have been collected during a FP6 integrated research project which aims to analyse the links between (new forms of) knowledge and policy making, we will develop a methodological discussion about the way sociology (of law) can trace the place and role of knowledge in policy making." [less ▲]

Detailed reference viewed: 35 (9 ULg)
Peer Reviewed
See detailLe droit procéduralisé comme intermédiaire : méthode et approche diachronique
Cerfontaine, Gaëtan ULg

Conference (2009, July 07)

Cette communication est basée sur une recherche empirique menée pendant près d'un an sur un programme européen de développement durable de l'économie rurale appelé LEADER (Liaison Entre Actions de ... [more ▼]

Cette communication est basée sur une recherche empirique menée pendant près d'un an sur un programme européen de développement durable de l'économie rurale appelé LEADER (Liaison Entre Actions de Développement de l'Economie Rurale). Ce dernier s'inscrit dans un mouvement, abondamment commenté par la littérature sociologique, de territorialisation et de procéduralisation de l'action publique (Duran, Thoenig, 1996), conférant aux acteurs locaux un pouvoir inédit de définition des enjeux. La majorité de ces travaux souligne les relations d'interdépendance et les modalités de coordination entre les différents acteurs (Le Galès, 1995) et met également en évidence un système articulant les différentes logiques d'action (Crozier, Friedberg, 1977 ; Musselin, 2005). Toutefois, les interactions et les jeux de pouvoir, qui figurent au cour de la sociologie de l'action organisée, ne rendent compte, à eux seuls, que de certaines formes relativement stables de la vie des organisations (Friedberg, 1993). Basée sur une méthodologie fondée sur les entretiens face à face (Friedberg, 1988), cette approche analytique semble mieux se prêter à l'analyse de la permanence que des processus qui sous-tendent l'innovation. L'apparition depuis quelques années d'analyses symétriques conférant un pouvoir d'actantialité aux objets (Callon, 1986) a contribué au développement d'approches par les instruments (Le Galès, Lascoumes, 2005) pouvant intégrer les questions classiques que posent la science politique et la sociologie de l'action publique (Lascoumes, 1996). Considérer les politiques procédurales comme des objets intermédiaires (Mélard, 2008) permet ainsi de rendre compte de leur capacité de médiation (Latour, 2006) et de donner un compte rendu de l'action plus dynamique. Comme ce fut le cas pour notre travail, l'entrée dans l'analyse par les controverses comme le suggère ce courant théorique n'est cependant pas toujours possible. L'entrée par les nombreux documents produits tels que les programmes de développement stratégique, les présentations de projets ou les évaluations, constitue ainsi, non pas une solution du moindre mal, mais au contraire, comme l'a montré Florian Charvolin (2003), une méthode permettant de déployer toute la capacité médiatrice de ces instruments procéduralisés [less ▲]

Detailed reference viewed: 54 (9 ULg)
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See detailVehicle loading optimization with stochastic supply
Amand, Guillaume ULg; Arda, Yasemin ULg; Crama, Yves ULg et al

Conference (2009, July 07)

The increased availability of information makes it possible to coordinate processes which are usually functionnally separated in large companies, such as production and transportation. This work ... [more ▼]

The increased availability of information makes it possible to coordinate processes which are usually functionnally separated in large companies, such as production and transportation. This work investigates the optimization of vehicle loading for individual orders over a multiperiod horizon when items have stochastic release dates from production, and time windows are imposed for delivery at the customer plant. The loading decisions are made in order to minimize the expected cost. Starting from the deterministic model, we develop scenario-based models for the stochastic version of the problem and we investigate the performance of various solution methods. [less ▲]

Detailed reference viewed: 29 (10 ULg)
Peer Reviewed
See detailRI48 in very early AD
Adam, Stéphane ULg; Salmon, Eric ULg

Conference (2009, July 06)

Detailed reference viewed: 13 (1 ULg)
See detailLe film exposé : Retour(s), reprise(s), surprise(s)
Thonon, Jonathan ULg

Conference (2009, July 05)

Detailed reference viewed: 15 (0 ULg)
See detailUnderstanding the Mechanism of Amyloid Fibrils Formation by Human Lysozyme
Dumoulin, Mireille ULg

Conference (2009, July 04)

Detailed reference viewed: 7 (1 ULg)
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See detailDynamic analysis and preliminary design of twin-cylinder engines for clean propulsion systems
Louvigny, Yannick ULg; Vanoverschelde, Nicolas; Janssen, Guy et al

Conference (2009, July 02)

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines ... [more ▼]

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines regain interest for using in urban cars or as prime movers in hybrid electric cars. One difficulty with engine having few cylinders (three or less) comes from the balancing of the inertia forces created by the moving parts. Several models (from simple analytical model to complex flexible multibody simulation) of different configurations of twin-cylinder engine are developed. These models allow computing the inertia forces and moments generated by the engines and computing the strains and stresses of engine components. An important step is the engine balancing by modification of the crankshaft counterweights or by addition of balance shafts. The effect of the gas pressure on the balancing and on the component’s strains and stresses is also modelled. At the end, a comparison of the different configurations of twin-cylinder engine is provided [less ▲]

Detailed reference viewed: 130 (12 ULg)
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See detailSpatial distribution of accumulation in the Adélie Land - Comparison of the Antarctic GLACIOCLIM-SAMBA observation data with remote sensing techniques and high-resolution climate models
Agosta, Cécile ULg; Genthon, Christophe; Favier, Vincent et al

Conference (2009, July)

The Surface Mass Balance (SMB) of Antarctica is typically much larger within the first 200 km from the coast than further inland. This is also likely where much of the SMB change is expected due to ... [more ▼]

The Surface Mass Balance (SMB) of Antarctica is typically much larger within the first 200 km from the coast than further inland. This is also likely where much of the SMB change is expected due to climate warming. That is why since 2004 the GLACIOCLIM- SAMBA French observatory monitors the SMB in this region with spatial scales resolving those of climate models. A stakes line made of 91 stakes was deployed along a 150 km transect from the coast of Adélie Land towards Dome C on the plateau. This transect is surveyed each year and 3 complete records are now available. We first compare recent SMB measurements with older reports from the 1972-1992 period. We show that a significant fraction of the observed kilometer-scale spatial variability is stationary with time. Moreover the large spatial and inter-annual variabilities of recent measurements are consistent with the historical ones. The lateral spatial significance of the transect is then evaluated using the background remote-sensing- based model of Arthern et al. (2006). Finally, results from 3 high-resolution climate models are presented and compared with the field reports: the global atmosphere-surface climate model LMDZ4 zoomed to reach a 35 km resolution over Antarctica, the regional atmospheric climate model MAR developed for polar regions (20 km resolution) and the ECMWF analysis (50 km resolution). We show large differences between the 3 models, which don’t have the same ability to reproduce the meso-scale characteristics of the distribution of the observed SMB in the critical coast-to-plateau area. [less ▲]

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See detailMultidimensional fluctuation, pseudo-guessing and carelness IRT person parameters models
Raîche, Gilles; Magis, David ULg; Blais, Jean-Guy

Conference (2009, July)

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See detailManagement et Justice: la mesure de la charge de travail des magistrats.
Delvaux, David ULg

Conference (2009, July)

A considerable number of articles, conferences and other seminars are dedicated to the topic of the “modernization” of Justice. This expansion of debates around judicial management, certainly reflects the ... [more ▼]

A considerable number of articles, conferences and other seminars are dedicated to the topic of the “modernization” of Justice. This expansion of debates around judicial management, certainly reflects the complexity of the stakes related to this process of modernization, and accounts for the difficulties which the reformers of justice must face. This complex process appears resolutely multi dimensional, articulating managerial, legal, economic and social considerations. Much more than a political rhetoric of the change, the process of modernization of courts is characterized by the development of a multitude of tools related to a new reference frame of effectiveness, efficiency and quality. One of these tools, illustrates the stakes and difficulties met by that the reformers of Belgian Justice: an instrument to measure the workload of magistrates. [less ▲]

Detailed reference viewed: 77 (10 ULg)
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See detailA maġribī copy of the Kitāb al-Faraj baʿd aš-Šidda by the ʿIrāqī qāḍī at-Tanūḫī. Study of a University of Liège (Belgium) manuscript
Franssen, Elise ULg

Conference (2009, July)

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well ... [more ▼]

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well-known work Kitāb al-Faraj baʿd aš-Šidda, by the ʿIrāqī qāḍī at-Tanūhkhī (327-384/939-994). She describes the manuscript and places her detailed description within the framework of the modern scholarly and bibliographical references on Abbasid literature in general and on recent developments in codicology and paleography in particular. She also discusses the relationship of the Liège manuscript with some of the printed editions of the Kitāb al-Faraj baʿd aš-Šidda. [less ▲]

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See detailEquivalent mixed model for joint genetic evaluation considering molecular and phenotypic information
Gengler, Nicolas ULg; Colinet, Frédéric ULg

Conference (2009, July)

Currently efforts are underway to introduce molecular information into genetic evaluation systems. A particular situation is genomic selection however simpler cases exists where major genes are known and ... [more ▼]

Currently efforts are underway to introduce molecular information into genetic evaluation systems. A particular situation is genomic selection however simpler cases exists where major genes are known and used by breeders. A new alternative strategy for the prediction of gene effects and especially their smooth integration into genetic evaluations based on an equivalent method was developed from existing theory. Underlying hypothesis were based on the idea that knowledge of genotypes will not affect overall additive genetic variance but only change expected values of genetic effects for animals with known genotypes. The developed equations were modified to allow that not all animals were genotyped. As the underlying mixed model is open a very large range of models can be used in situations including random regression models, multipletrait, maternal effects and multiple-across-country-evaluation models. Computations involved successive solving of two mixed models, with the use of an linear extrapolation to speed up convergence of gene effects. The method was tested for several known major genes and QTL, e.g. for the mh gene in the dual-purpose Belgian Blue population in Belgium. Modifications of the method could also be developed to be useful in the context of genomic selection. [less ▲]

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See detailGenetic variability of test-day stearoyl coenzyme-A desaturase 9 activity
Arnould, Valérie ULg; Gengler, Nicolas ULg; Soyeurt, Hélène ULg

Conference (2009, July)

Milk fatty acid (FA) profile is far from the optimal fat composition in regards to human health. Different natural sources of variation such as feeding or genetics could be used to modify the contents of ... [more ▼]

Milk fatty acid (FA) profile is far from the optimal fat composition in regards to human health. Different natural sources of variation such as feeding or genetics could be used to modify the contents of unsaturated fatty acids. The impact of feeding is well described; however, genetics effects on the milk FA composition are not well studied. Increasing the unsaturated fatty acids contents of bovine milk could have the potential to raise the nutritive and therapeutic values of dairy products. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a potential functional candidate gene affecting milk fat composition in dairy cattle. The objective of this research was to study the genetic variability on this enzyme activity across lactations. A total of 199,977 test-day records were obtained from 29,603 Holstein cows in first lactation, 154,267 records from 23,453 Holstein cows in second lactation, and 173,244 records from 75,887 Holstein cows in third and later lactations. The used model was a multiple-trait random regressions test-day model. Fixed effects were: herd × date of test, and class of age. Random effects were: herd × year of calving, permanent environmental, additive genetic, and residual effects. The studied traits were milk yield, protein content, percentage of fat, monounsaturated fatty acids estimated by mid-infrared spectrometry, and the ratios reflecting the delta-9 activity. Obtained heritability estimates of delta-9 as well as the genetic and phenotypic correlations varied across lactations. These results suggest potential improvements of milk fat composition based on delta-9 activity using animal selection and appropriate management practices. [less ▲]

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See detailUnderstanding the controversies of inter-organizational ambidexterity with actor-network theory
Antoine, Mélanie ULg; Degré, Julie ULg

Conference (2009, July)

Generally considered at an intra-organisational level, ambidexterity can also be found at inter-organisational level where organisations decide to collaborate by sharing between them activities of ... [more ▼]

Generally considered at an intra-organisational level, ambidexterity can also be found at inter-organisational level where organisations decide to collaborate by sharing between them activities of exploration and exploitation, according to their core competence. In this paper, we examine these collaborations, which are often presented as win-win solutions. In two case studies of R&D partnerships receiving public financing, we show the tensions that run through these alliances and the controversies that set the partners against each other. Our analysis, based on the actor-network theory, indicates that the conditions for successful inter-organisational ambidexterity do not exist a priori. The success of a partnership rather relies on a continuous translation process creating the convergence between the parties involved. [less ▲]

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See detailA robust statistical approach to differential item functioning
Magis, David ULg; De Boeck, Paul

Conference (2009, July)

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See detailProgress in the asteroseismic analysis of the pulsating sdB star PG 1605+072
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

Conference (2009, July)

The hot pulsating sdB star PG 1605+072 exhibits uncommon spectroscopic and pulsation prop- erties, and is one of the biggest challenge in the field of sdB star modeling. Two hypotheses have been proposed ... [more ▼]

The hot pulsating sdB star PG 1605+072 exhibits uncommon spectroscopic and pulsation prop- erties, and is one of the biggest challenge in the field of sdB star modeling. Two hypotheses have been proposed to explain its unusually rich pulsation spectrum. The first is the natural explanation of a fast-rotating pulsator, which lifts the (2l+1)-fold degeneracy of the frequency components. Another approach, where PG 1605+072 can be seen as a slow rotator, considers that the numerous low amplitude frequency components are second- and third-order harmonics and nonlinear com- binations of the highest amplitude frequencies. We investigated the two hypotheses in the light of asteroseismology, using our latest tools - including pulsation codes that incorporate star rotation and new generation complete sdB models. The results of both approaches are presented, showing interesting results and raising new questions for our understanding of this mysterious sdB star. [less ▲]

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See detailAn item ixture model to detect differential item functioning
Frederickx, Sofie; Tuerlinckx, Francis; De Boeck, Paul et al

Conference (2009, July)

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See detailEvolution of food design: from recipe to formulation concept
Blecker, Christophe ULg

Conference (2009, July)

Detailed reference viewed: 23 (6 ULg)
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See detailCorrelates of personal fluctuation, pseudo-guessing, and inattention subject parameters: relations with parametric and non parametric person fit indices
Béland, Sébastien; Raîche, Gilles; Brassard, Patricia et al

Conference (2009, July)

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See detailVoting at 16: A Study of Political Reasoning Among Young French-Speaking Belgians
Fournier, Bernard ULg; Flaba, Elodie ULg

Conference (2009, July)

The question of lowering the voting age to 16 has long been debated in university circles. In the last Austrian elections, young people aged 16 and older were invited to vote, even if young people ... [more ▼]

The question of lowering the voting age to 16 has long been debated in university circles. In the last Austrian elections, young people aged 16 and older were invited to vote, even if young people themselves are divided over this issue, even hostile to the idea. Nevertheless, isn’t such a question, which is rarely discussed by the larger public and touches on several dimensions of a person’s life, an ideal topic for a debate, where the confrontation of ideas may change opinions and reveal – or even modify – young people’s global attitudes towards political interest and participation? A sample of one hundred 15- to 21-year-old youth in French-speaking Belgium was selected to discuss the possibility of lowering the voting age to 16, as well as political interest and political participation, during one day with five experts. The same questionnaire was filled in in the beginning and at the end of the day. These first results are presented here. They show little evolution during the discussion, in a sample already largely against the idea of lowering the voting age. [less ▲]

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See detailProcedural Law in Tax Law – Belgian Report
Richelle, Isabelle ULg

Conference (2009, July)

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See detailStudy of the bedload transport in gravel bed rivers
Houbrechts, Geoffrey ULg; Hallot, Eric ULg; Peeters, Alexandre ULg et al

Conference (2009, July)

Bedload transport has been studied in Ardenne rivers using different methods. Experiments with marked pebbles were carried out on gravel bed rivers in order to determine critical parameters of ... [more ▼]

Bedload transport has been studied in Ardenne rivers using different methods. Experiments with marked pebbles were carried out on gravel bed rivers in order to determine critical parameters of mobilisation. The tracking of more than 1000 elements marked with PIT-tags (Passive Integrated Transponder) has been performed on different sized rivers during three hydrological seasons. These surveys allowed us to determine the initial motion of bed material, to measure the distance of particle travel from flood to flood, to reconstruct the trajectories of pebbles, to analyze the burying of particles into the subsurface layer and to identify the trapping sites and their effects on the bedload progression. On the same rivers, the thickness of the active bed layer has been measured using scour chains. It appears that the mobilised layer thickness increases with specific stream power. Bedload discharge of several floods has also been estimated crossing the active layer thickness and the mean progression distance of marked pebbles. Pits have been dug across the bed of a gravel bed stream (catchment area of 12 km²) in order to trap all particles moving on the bed. Volume of sediments trapped has been measured after each flood event and the largest elements mobilised have been measured. These observations show that bedload trapped is clearly more important that bedload discharge estimated by the method of scour chains and marked pebbles. This difference is for the most part explained by the trapping of sandy matrix from the subsurface layer, which is also moving on the bed. In this headwater stream (forested floodplain), the specific bedload discharge is only 0.4 t.km-1.year-1. Such a value is relatively low in comparison with other Ardenne rivers (up to 2,5 t.km-1.year-1), but may be partly explained by numerous vegetation logjams, which slow down bedload progression and increase bed roughness. [less ▲]

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See detailAction-research in inter-organizational partnerships: can the institutional entrepreneur theorize his/her own institutionalization practices?
Xhauflair, Virginie ULg; Pichault, François ULg

Conference (2009, July)

In the current context of a crisis in social regulation, the issue of institutionalisation of new forms of compromise has gained central importance. The “local” level is increasingly more often presented ... [more ▼]

In the current context of a crisis in social regulation, the issue of institutionalisation of new forms of compromise has gained central importance. The “local” level is increasingly more often presented as one of the levers for recasting social regulation. This involves designing a new framework for interaction between the micro-economic stakeholders on the labour market. In this way, our research focused on the conditions for institutionalisation of compromises implemented at inter-company level conciliating the need for flexibility and security. We adopted a field approach, anchored in “flexicurity” practices implemented at local level. In order to do this, we set up a partnership made up of the various stakeholders on the labour market in our region, within the framework of a European action-research project. With these partners’ collaboration, we observed the existing practices and tested new practices as part of pilot projects, whose failure and/or success (qualified in terms of “desirability” of the compromises implemented) provided us with a wealth of longitudinal data. Having become veritable “institutional entrepreneurs” through spurring on and supporting these experiments, we have contributed to the development, alongside our “practitioner” partners, of a flexicurity practices analysis grid. It allows their desirability to be qualified and helps guide the implementation of such innovations. We then returned to our status of researchers, transforming this “local” knowledge into generic knowledge actionable through an abductive process that establishes links between our own theorisation and the existing knowledge in the scientific field. [less ▲]

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See detailLongitudinal analysis of ordinal data
Donneau, Anne-Françoise ULg; Mauer, M

Conference (2009, June 30)

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See detailActualité des droits communautaire et belge de la concurrence
Petit, Nicolas ULg

Conference (2009, June 29)

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See detailDividends and Foreign Performance Signaling
Muller, Aline ULg; Joliet, Robert

Conference (2009, June 29)

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See detailCapital structure effects of international expansion
Muller, Aline ULg; Joliet, Robert

Conference (2009, June 28)

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See detailL’apport des focus groups dans la compréhension des structures de raisonnement quant à la conscientisation accompagnant la transmission des faits génocidaires
Grandjean, Geoffrey ULg

Conference (2009, June 26)

La transmission des faits génocidaires auprès des jeunes générations semble être accompagnée d’une conscientisation favorisant l’adoption par les adolescents de certains comportements ou attitudes. Pour ... [more ▼]

La transmission des faits génocidaires auprès des jeunes générations semble être accompagnée d’une conscientisation favorisant l’adoption par les adolescents de certains comportements ou attitudes. Pour appréhender cette conscientisation, des focus groups ont été réalisés auprès d’adolescents belges francophones (âgés de 16 à 18 ans). Le but était de voir, à travers les discussions, comment ces jeunes ont internalisé la conscientisation accompagnant la transmission des faits génocidaires. Cette communication contribue ainsi au débat méthodologique qui entoure l’utilisation des focus groups dans la recherche en science politique et sociale et plus particulièrement pour saisir les structures de raisonnement de ces jeunes, considérées dans une dynamique sociale. Afin d’illustrer ce propos, quelques résultats sont présentés. [less ▲]

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See detailLa prévention médicalisée est-elle néfaste pour nos patients ? Et à quelles conditions leur serait-elle bénéfique ?
Vanmeerbeek, Marc ULg

Conference (2009, June 25)

En examinant nos pratiques en prévention, il semble nécessaire de mieux asseoir la validité scientifique de nos actes, e.a. en prenant de la distance par rapport aux pressions commerciales. Il serait ... [more ▼]

En examinant nos pratiques en prévention, il semble nécessaire de mieux asseoir la validité scientifique de nos actes, e.a. en prenant de la distance par rapport aux pressions commerciales. Il serait utile de rapprocher la médecine générale et la santé publique, en augmentant la place de la promotion de la santé et ne développant la place du patient. De nouvelles tâches sont à imaginer dans un partenariat multidisciplinaire. [less ▲]

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See detailApplying control volume finite element for modelling direct injection boom spraying flow
El Aissaoui, Abdellah; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

Conference (2009, June 23)

Assessment of injection lag transport and uniformity of direct injection boom sprayer is an important issue for successful variable rate spraying technology. To estimate the boom lag transport and ... [more ▼]

Assessment of injection lag transport and uniformity of direct injection boom sprayer is an important issue for successful variable rate spraying technology. To estimate the boom lag transport and pressure loss, a numerical model is formulated on the basis of fluid hydrodynamic conservation equations. The software is implemented in visual basic. To solve the pressure – velocities equations, control volume finite element method (CV) is used to delimit elementary volumes of the boom. Linearization of the conservation laws is ensured by considering discrete form of the equations and calculating velocity and pressure step by step throughout the whole boom. The flow behaviour is simulated into a boom section divided into N elementary volumes, each of them including one nozzle. To test the model, three boom diameters (5, 6 and 8 mm) and two chemical viscosities (10-6 and 10-5 m2/s) were used. Experimental trials are carried out on boom having 2.5 m length (5 nozzles) for measuring pressure gradient and lag transport. Results showed that the model can predict the pressure losses and the lag transport accurately (error within 5%) to optimize boom designs. [less ▲]

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See detailSome Remarks on Dominique Pradelle's Lecture: "Does Husserl have a Reducibility Principle?"
Dewalque, Arnaud ULg

Conference (2009, June 23)

Comments on D. Pradelle's lecture (for details, see the attached document).

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See detailOrganoclays prepared in supercritical CO2: implication of onium stability on the properties of PA6 nanocomposites
Naveau, Elodie ULg; Calberg, Cédric ULg; Detrembleur, Christophe ULg et al

Conference (2009, June 23)

The organomodification of layered silicates via our patented supercritical CO2 ion-exchange process, enables the use of a large variety of surfactants, among which phosphonium and ammonium ions of the ... [more ▼]

The organomodification of layered silicates via our patented supercritical CO2 ion-exchange process, enables the use of a large variety of surfactants, among which phosphonium and ammonium ions of the very same structure. The as-obtained organoclays were melt blended with PA6 and the morphology as well as the fire properties of the nanocomposites were studied. With the same degree of nanodispersion, longer ignition times were observed with phosphonium-modified clays compared to ammonium-modified clays. [less ▲]

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See detail‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation
Florence, Eric ULg

Conference (2009, June 23)

‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation. Eric Florence, PhD in Political and Social Sciences, Researcher at the Centre ... [more ▼]

‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation. Eric Florence, PhD in Political and Social Sciences, Researcher at the Centre for Ethnic and Migration Studies, the University of Liege. In this paper, I will look at the different kinds of values that are fostered within articles (diaries, letters, etc.) published in magazines for rural migrant workers. After having detailed the criterion used by editors of these magazines in the process of selecting or rejecting writings sent to them by migrant authors, I will detail three types of narrative modes found in magazines aimed at migrant workers. The first one signals suffering, disillusionment and sometimes irony. The second narrative mode entails claim making by migrant workers which are often backed by editors. I argue that this belongs to what O’Brien calls “contentious politics”. Eventually, the third mode examined in this paper will be thought of as strategic narrative framing on the part of migrant authors. In such framing the pedagogic role of guidance by editors is central I shall stress. But I shall argue at the same time that despite such framing, much of these writings are permeated by a powerful politics of desire and that such politics is particularly hard to analyse. In addition to a qualitative analysis of both published and unpublished writings by migrant workers and editors, I will also confront such writings and the values they convey to the fruit of my ethnographic fieldwork carried out in the Pearl River Delta between 2001 and 200 [less ▲]

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See detailFrom "Spirou" and "Tintin" to "Pilote". A French break from the Belgian classicism
Dejasse, Erwin ULg

Conference (2009, June 19)

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See detailThe daughters of family business: Developing a global research agenda
Nelson, Teresa; Constantinidis, Christina ULg

Conference (2009, June 18)

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See detailNew fluorinated surfactants for nanogels preparation
Alaimo, David ULg; Rieger, Jutta; Beigbeder, Alexandre et al

Conference (2009, June 18)

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer ... [more ▼]

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer and used as stabilizers for the dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) in fluorinated solvent, namely alpha,alpha,alpha-trifluorotoluene (TFT). The effect of the amount and the architecture of the copolymer on the size and the stabilization of the particles was studied. Whatever the experimental conditions, scanning electron microscopy showed the formation of submicronic (typically about 300 nm) spherical particles, with a narrow size distribution. The principal difference emerges from the concentration of surfactant. Indeed, at higher copolymer concentration, smaller and less aggregated particles were produced. These results were confirmed by dynamic light scattering but these measurements also revealed the presence of larger aggregates (1,5 micrometer). Furthermore, the surfactant properties of the copolymers were investigated by measuring the interfacial tension at the H2O/TFT interface, and the results were correlated to their stabilizing efficiency in the dispersion polymerization of HEMA. [less ▲]

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See detailImpact of contamination on empirical and theoretical error
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg

Conference (2009, June 18)

Classification analysis allows to group similar objects into a given number of groups by means of a classification rule. Many classification procedures are available : linear discrimination, logistic ... [more ▼]

Classification analysis allows to group similar objects into a given number of groups by means of a classification rule. Many classification procedures are available : linear discrimination, logistic discrimination, etc. Focus in this poster will be on classification resulting from a clustering analysis. Indeed, among the outputs of classical clustering techniques, a classification rule is provided in order to classify the objects into one of the clusters. More precisely, let F denote the underlying distribution and assume that the generalized kmeans algorithm with penalty function is used to construct the k clusters C1(F), . . . ,Ck(F) with centers T1(F), . . . , Tk(F). When one feels that k true groups are existing among the data, classification might be the main objective of the statistical analysis. Performance of a particular classification technique can be measured by means of an error rate. Depending on the availability of data, two types of error rates may be computed: a theoretical one and a more empirical one. In the first case, the rule is estimated on a training sample with distribution F while the evaluation of the classification performance may be done through a test sample distributed according to a model distribution of interest, Fm say. In the second case, the same data are used to set up the rule and to evaluate the performance. Under contamination, one has to replace the distribution F of the training sample by a contaminated one, F(eps) say (where eps corresponds to the fraction of contamination). In that case, thetheoretical error rate will be corrupted since it relies on a contaminated rule but it may still consider a test sample distributed according to the model distribution. The empirical error rate will be affected twice: via the rule and also via the sample used for the evaluation of the classification performance. To measure the robustness of classification based on clustering, influence functions of the error rate may be computed. The idea has already been exploited by Croux et al (2008) and Croux et al (2008) in the context of linear and logistic discrimination. In the computation of influence functions, the contaminated distribution takes the form F(eps) = (1 − eps)*Fm + eps* Dx, where Dx is the Dirac distribution putting all its mass at x. It is interesting to note that the impact of the point mass x may be positive, i.e. may decrease the error rate, when the data at hand is used to evaluate the error. [less ▲]

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See detailLa réception de l'approche law & economics par les juristes
Sibony, Anne-Lise ULg

Conference (2009, June 16)

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See detailMyopia, redistribution and pensions
Pestieau, Pierre ULg

Conference (2009, June 15)

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See detailStudy of diffusive limitations in Proton Exchange Membrane Fuel Cells (PEMFC)
Brigaudet, M.; Berthon-Fabry, S.; Beauger, C. et al

Conference (2009, June 14)

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See detailCarbon xerogels as supports for catalysts and electrocatalysts
Job, Nathalie ULg; Berthon-Fabry, S.; Lambert, Stéphanie ULg et al

Conference (2009, June 14)

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See detailClean Development Mechanisms (CDM) and Sustainable Development in South Countries
Ozer, Pierre ULg

Conference (2009, June 13)

The Clean Development Mechanism (CDM) allows emission-reduction (or emission removal) projects in developing countries to earn Certified Emission Reduction (CER) credits, each equivalent to one tonne of ... [more ▼]

The Clean Development Mechanism (CDM) allows emission-reduction (or emission removal) projects in developing countries to earn Certified Emission Reduction (CER) credits, each equivalent to one tonne of CO2. These CERs can be traded and sold, and used by industrialized countries to a meet a part of their emission reduction targets under the Kyoto Protocol. The mechanism stimulates sustainable development and emission reductions, while giving industrialized countries some flexibility in how they meet their emission reduction limitation targets. Accepted projects must qualify through a rigorous and public registration and issuance process designed to ensure real, measurable and verifiable emission reductions that are additional to what would have occurred without the project. Between November 2004 and May 2009, the mechanism has registered 1653 projects and is anticipated to currently produce CERs amounting to 303 106 tonnes of CO2 equivalent yearly. The mechanism is extremely interesting since it is the first global, environmental investment and credit scheme of its kind, providing a standardized emissions offset instrument. However the geographical distribution of the CDM projects is revealing very large differences in between developing countries since China, India, Brazil and South-Korea totalise 82% of the CERs while Africa only represents 3,3% of the total. [less ▲]

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See detailValidité et objectivité entre logique et phénoménologie
Boccaccini, Federico ULg

Conference (2009, June 13)

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See detailDevelopment of multilayered chitosan-based nanofibers for tissue engineering
Croisier, Florence ULg; Aqil, Abdelhafid ULg; Detrembleur, Christophe ULg et al

Conference (2009, June 13)

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method ... [more ▼]

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method for surface coating, based on electrostatic interactions. It enables the controllable deposition of a variety of polyelectrolytes including synthetic and natural materials, with designable layer structure, defined layer thickness and size. Electrospinning (ESP) allows the fabrication of polymer fibers ranging from nanometers to a few microns in diameter, depending on the polymer characteristics (a.o. molecular weight, solution viscosity and conductivity) and processing conditions (electric potential, distance between syringe-capillary and collection plate, concentration, flow rate). Mats of nanofibers produced by ESP display a very large surface area-to-volume ratio and high porosity with very small pore size. The nanometric scale of electrospun fibers also proves a positive effect on cellular growth, as fiber mats mimic extracellular matrix structure. The association of these two techniques with the use of biocompatible and biodegradable polymers such as chitosan, gives outstanding prospects in the field of biomedical applications, especially for the preparation of wound dressings, artificial skin or tissue engineering scaffolds. In the present study, a charged copolymer, poly(methylmethacrylate-block-methacrylic acid), was added to a poly(ε-caprolactone) or poly(D,L-lactide) solution before electrospinning in order to prepare surface charged nanofibers. Oppositely charged polyelectrolytes – chitosan and poly(styrene sulfonate) or hyaluronic acid – were then alternately deposited on these aliphatic polyester fiber “cores” using LBL method. The aliphatic polyester core was also removed selectively to confirm the growth of a multilayered shell, obtaining hollow fibers. [less ▲]

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See detailTowards an optimal enforcement of Competition rules in Europe
Petit, Nicolas ULg

Conference (2009, June 12)

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See detailIR spectroscopy of DNA structures
Gabelica, Valérie ULg

Conference (2009, June 11)

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See detailMaternal transfer of mercury to offspring in phocids
Habran, Sarah ULg; Pomeroy, Paddy; Debier, Cathy et al

Conference (2009, June 09)

Marine mammals may display high mercury (Hg) levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Indeed, Hg could be transferred from ... [more ▼]

Marine mammals may display high mercury (Hg) levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Indeed, Hg could be transferred from mothers to fetuses via the placenta and to suckling pups via the milk, potentially affecting them during their most sensitive periods of development. Some lactating female phocids fast during the suckling period. This fasting period involves not only an important mobilization of energy reserves, but also mobilization of potentially associated contaminants. We studied and compared maternal transfer of Hg to offspring in two phocid species: the northern elephant seal (Mirounga angustirostris) from the Californian coast and the grey seal (Halichoerus grypus) from the Isle of May in Scotland. Total mercury concentrations (THg) were measured in whole blood and maternal milk of 20 mother-pup pairs of each species in early and late lactation. Methylmercury (MeHg) levels were also measured in the blood and milk of grey seals. Results indicated that Hg passed from the maternal tissue into the phocid milk. Milk showed a range of THg levels from 15 to 60 ppb (ng.g-1-wet-weight). From the first days after birth, pups displayed relatively high blood Hg levels suggesting that a Hg transfer through placenta occurred. Blood Hg levels in mothers and pups also varied significantly throughout lactation. While maternal levels doubled, pup levels were reduced by half between the beginning and the end of lactation. Remobilization of proteins and lipids during fasting and milk production in mothers might lead to a release of Hg in blood and therefore increase the levels in late lactation. On the contrary, Hg would be progressively stored in pup organs during their development. Decreasing Hg levels in pups also suggest that the Hg intake via the milk might be lower than that via the placenta. This study highlights a transplacental and transmammary transfer of Hg in both phocid populations. However, further toxicology studies are needed to help understand the potential impact of this Hg transfer. Results also showed that physiological processes such as lactation and/or fasting can modify Hg levels in the blood of mothers and pups. Therefore, such processes and body condition should be considered carefully when interpreting Hg levels in the framework of biomonitoring. [less ▲]

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See detailStudy of vocal therapy efficiency: Comparison of 2 methods
Morsomme, Dominique ULg; Vliegen, Liz; MARTINOT, Gisèle ULg

Conference (2009, June 06)

Our objective is to compare the efficiency of 2 methods of vocal therapy. Method A consists of exercises centred on the breath, the vibration and the resonance. Method B associates the principles of the ... [more ▼]

Our objective is to compare the efficiency of 2 methods of vocal therapy. Method A consists of exercises centred on the breath, the vibration and the resonance. Method B associates the principles of the muscular chains (Struyf) and the motor coordination ( Piret-Béziers) with the eutonia of G. Alexander. 11 patients (mean age: 32.9) presenting a functional dysphonia or nodules of the vocal folds were distributed in both groups. We compared their results pre and post therapy (interval: 6 months) at subjective (GRB, VHI) and objective (acoustics and aerodynamics) measures. We observe an improvement of the post therapeutic measures in both groups (VHI p < 0.005; maximum intensity p < 0.05; intensity range p < 0.05; frequency range p<0.05 and maximum frequency p< 0.05). We observe an improvement of the post therapeutic measures for the group A for the grade and the roughness on a sustained [a] ( p < 0.05) and for the grade, the roughness and the breathiness on text reading (p < 0.05). Both methods are equivalent to improve the vocal quality of the dysphonic patients in this study. [less ▲]

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See detailIntroduction et conclusions
Delfosse, Annick ULg

Conference (2009, June 05)

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See detailMéditations sartriennes de Bourdieu
Cormann, Grégory ULg

Conference (2009, June 04)

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See detailA simple method for determination of electrospray response factors of noncovalent complexes: application to DNA G-quadruplex binding and self-assembly
Gabelica, Valérie ULg; Amato, Jussara; Oliviero, Giorgia et al

Conference (2009, June 04)

Introduction Electrospray mass spectrometry (ESI-MS) is now widely used to investigate non-covalent assemblies, and the power of the method resides in the individual detection of the various ... [more ▼]

Introduction Electrospray mass spectrometry (ESI-MS) is now widely used to investigate non-covalent assemblies, and the power of the method resides in the individual detection of the various stoichiometries present in the mixture. However, to characterize the mixture quantitatively (i.e. to determine the concentration of each constituent), the biggest challenge comes from the fact that electrospray response factors of all constituents can be different, especially for constituents of significantly different masses and charges. Here we present a novel and simple method to determine the response factors of all constituents, using an internal standard. The method can be transposed to a wide variety of biological problems and to different ionization methods. Experimental All oligodeoxynucleotides were purchased from Eurogentec (Seraing, Belgium). G-quadruplexes formation is induced by addition of ammonium acetate (150 mM) to the guanine-rich strand. Polythymines (e.g. dT6) with m/z not overlapping with those of the complexes were used as internal standards. The ESI mass spectra were acquired using a Q-TOF Ultima Global (Waters, Manchester, UK) in the negative ion mode, with source parameters optimized for detecting the intact complexes. Quadruplex-ligand binding constants were quantified by titration of the quadruplex with the ligand (BOQ1, Dr. Teulade-Fichou). The kinetics of G-quadruplex self-assembly was monitored on-line, with the starting time defined by the addition of ammonium to the single strand. Peak areas were calculated using MassLynx and data were processed using Mathcad. Preliminary results Let us illustrate the method for the characterization of the self-assembly of dCGGTGGT. In NH4OAc, this G-rich strand forms a tetramer within a few hours, but the most stable species is an octamer, which is formed after a few days. The relative intensities of monomer, tetramer and octamer vary with the experimental settings: harsher conditions favor the transmission of the larger complexes. It is therefore foolish to assume that the response factors of the monomer, tetramer and octamer are equal. Using dT6 as an internal reference, we monitored the self-assembly kinetics by recording at several time points the following intensities: I(ref2-), I(G12-), I(G45-) and I(G89-), where Gn indicates a complex containing n G-rich strands. For each species Gn, we define Rn as its response factor relative to that of the reference: [Gn]/[ref] = Rn * I(Gn)/I(ref). At each time point the mass balance equation for the strand concentration must be satisfied: [G]tot = [G1] + 4[G4] + 8[G8]. Substituting with the definition of Rn’s one obtains a set of equations: [G]tot = [ref] * {R1*(I(G1)/I(ref) + 4R4*I(G4)/I(ref) + 8R8*I(G8)/I(ref)}. If the number of equations (time points) is greater than the number of unknown response factors, the least-squares fit to this system of equations is calculated using the Moore-Penrose pseudoinverse of the matrix constituted by the intensity ratios. Once all response factors are known, concentrations are recalculated at each time point, providing detailed characterization of the reaction kinetics, including reaction intermediates. We will also show that the same method can be used to quantify ligand binding using titration of the substrate by the ligand. This will be illustrated with titration of the quadruplex (TGGGGT)4 by ligand BOQ1. This ligand binds to the quadruplex and also produces ligand-bridged quadruplex multimers, which the present method allows quantifying for the first time. [less ▲]

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See detailA test of the Job Demands-Resources model: A social identity theory perspective.
Barbier, Marie ULg; Hansez, Isabelle ULg

Conference (2009, June 03)

The Job Demands-Resources mode has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic ... [more ▼]

The Job Demands-Resources mode has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic process leading to, respectively, engagement and exhaustion has been demonstrated. The aim of our study is to test this model using predictors derived from Social Identity Theory (or SIT). We hypothesize that working in a negatively valued occupation is associated with exhaustion and health problems, whereas a high identification with one’s occupational group is associated to engagement and low intent to quit the organisation (or IQ). Structural equation modelling was performed on data collected in a public administration (N = 954). We collected measures of occupation value, group identification, exhaustion, engagement, health problems and IQ. Items were parcelled based on their skewness. Excepted from Chi² being significant (p = .00), fit indices were satisfactory. The link between engagement and IQ is not significant but all other links go in the expected direction. We conclude that a test of the JDR model using SIT brings conclusive results. As a further step, it might be interesting to test interactive effects: results suggest that identification might buffer the relation between occupation value and exhaustion. Second, it might be interesting to introduce boundaries permeability, another key concept of SIT, as a third predictor. [less ▲]

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See detailNew developments in the functionalization of aliphatic polyesters by "click" copper-catalyzed azide-alkyne cycloaddition
Lecomte, Philippe ULg; Riva, Raphaël ULg; Schmeits, Stephanie ULg et al

Conference (2009, June 03)

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a ... [more ▼]

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a severe limitation for the development of novel applications. Our strategy aiming at functionalizing aliphatic polyesters relies on the “click” copper-catalyzed cycloaddition (CuAAC) of alkynes duly substituted by functional groups or even chains onto PCL bearing pendant azides. The aliphatic polyesters bearing pendant azides have been very efficiently synthesized by a straightforward approach, which relies on the ring-opening copolymerization of αClεCL (or γBrεCL) and εCL (or lactide) followed by reaction with sodium azide to convert pendant chlorides or bromides into azides. The alternative reported by Emrick et al. is based on the CuAAC reaction of azides substituted by any functional group onto copolyesters of poly(ε-caprolactone) bearing pendant alkynes. Interestingly enough, Emrick et al. carried out the CuAAc reaction in water at 80°C. Unfortunately, it turned out, at least in our hands, that these conditions can not be extended to the derivatization of more sensitive aliphatic polyesters because degradation was then unavoidable. Nevertheless, we found out that degradation can be minimized whenever the CuAAC reaction is carried out in an organic solvent at lower temperature. Typically, the CuAAC reaction was carried out in DMF or THF at 35°C. Recently, it was shown that supercritical carbon dioxide can be used as a more environmentally friendly solvent than DMF or THF. The contamination by catalytic residues of aliphatic polyesters functionalized by the CuAAC reaction is a severe limitation in view of future applications, especially in the biomedical field. In the last part of this talk, a special attention will be paid on our current efforts to get rid of copper residues. [less ▲]

Detailed reference viewed: 64 (22 ULg)
See detailImages et pathos. Figures de la créativité chez Aby Warburg
Hagelstein, Maud ULg

Conference (2009, June 03)

Detailed reference viewed: 16 (6 ULg)
Peer Reviewed
See detailMemory for visual items of central or marginal interest in complex scene: Impact of eye movements and subject’s expertise.
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2009, June 03)

In complex scene, memory for central interest items is better than memory for marginal interest items and this difference remains stable independently of the scene presentation duration (Melcher, 2006 ... [more ▼]

In complex scene, memory for central interest items is better than memory for marginal interest items and this difference remains stable independently of the scene presentation duration (Melcher, 2006). However, without eye movement recording, it is not possible to know whether central interest items are better remembered because they are more fixated or because they are more meaningful. To answer this question, we analysed the memory of complex scenes (paintings) according to the eye movements and subjects’ expertise. 15 novice subjects and 15 art historians (experts) were asked to look at 6 paintings that were separately and randomly presented for 10 seconds. After each painting presentation, subjects were asked questions about pictorial details of 3 categories: details of central or marginal interest and background information. Although experts had prior knowledge about the paintings, the accuracy of answers about the pictorial details did not differ between both groups: all subjects showed best memory for central information while they failed to remember background information and marginal details. Despite a longest time spent in the background zone, memory for these details was poorer than for central interest items, suggesting the importance of the meaning over the fixation duration. Eye movement recordings also showed novice’s answers were more accurate when they looked longer at the asked detail and when this detail was watched early on in the presentation while in the expert group, the accuracy of the answer was not influenced by the duration and moment they watched the asked detail. [less ▲]

Detailed reference viewed: 61 (0 ULg)
Peer Reviewed
See detailValidity of bench models in the learning of minimal invasive surgery
Blavier, Adelaïde ULg

Conference (2009, June)

Detailed reference viewed: 5 (1 ULg)